linux-kernel - Re: [PATCH] KVM: SVM: Mark SEV launch secret pages as dirty.

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Message-ID: <548b7b73-7a13-8267-414e-2b9e1569c7f7@redhat.com>
Date:   Wed, 23 Sep 2020 19:16:08 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Cfir Cohen <cfir@...gle.com>,
        "kvm @ vger . kernel . org" <kvm@...r.kernel.org>,
        Lendacky Thomas <thomas.lendacky@....com>,
        Singh Brijesh <brijesh.singh@....com>,
        Grimm Jon <Jon.Grimm@....com>,
        David Rientjes <rientjes@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: SVM: Mark SEV launch secret pages as dirty.

On 23/09/20 19:04, Sean Christopherson wrote:
>> Two of the three instances are a bit different though.  What about this
>> which at least shortens the comment to 2 fewer lines:
> Any objection to changing those to "Flush (on non-coherent CPUs)"?  I agree
> it would be helpful to call out the details, especially for DBG_*, but I
> don't like that it reads as if the flush is unconditional.

Hmm... It's already fairly long lines so that would wrap to 3 lines, and
the reference to the conditional flush wasn't there before either.

sev_clflush_pages could be a better place to mention that (or perhaps
it's self-explanatory).

Paolo